CN1695964A - Wireless system for monitoring safety of car tires - Google Patents
Wireless system for monitoring safety of car tires Download PDFInfo
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- CN1695964A CN1695964A CN 200410018355 CN200410018355A CN1695964A CN 1695964 A CN1695964 A CN 1695964A CN 200410018355 CN200410018355 CN 200410018355 CN 200410018355 A CN200410018355 A CN 200410018355A CN 1695964 A CN1695964 A CN 1695964A
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Abstract
A high-safety radio monitor system for the tyre of car is composed of an emitter arranged in the tyre and a receiver arranged in the driver cab of car. Said emitter consists of microcontroller, radio emitting unit, temp and pressure sensors, and antenna network. Said receiver comprises microcontroller, radio receiving unit, LCD, buzzer, reset circuit, RS232/TTL level converter, 12V/5V converter, shift register and LCD display.
Description
Technical field
The present invention relates to the vehicle tyre safety monitoring system, particularly a kind of in real time, the system of wireless monitor vehicle tyre safety index.
Technical background
According to statistics, 1/3 traffic accident is caused by the tire problem on the express highway.When the air pressure of one or more tires hangs down 20% or 25% than [cold conditions] use value of manufacturer's recommendation, send warning signal, or stipulate an air pressure lower bound, when tire pressure is lower than this value, send caution.Therefore, the measure that should take the lead in taking is that automobile must be equipped with tire pressure monitoring and alarming device.Purpose of the present invention just provides a kind of tire pressure of automobile tire monitoring and alarming device that is installed on the automobile.
The present invention has overcome the shortcoming that existing product is subject to disturb, product life is short, and a kind of disturbance rejection, reliable, wireless tyre safety monitoring system with intelligence and power saving function and RFID recognition function are provided.
Summary of the invention
The invention provides a kind of radio vehicle tyre safety monitoring system, this system's energy real-time intelligentization, disturbance rejection, low energy consumption, wireless monitor tire safety index, this system mainly comprises: can place the emitter in the tire and place the indoor receiver two large divisions of vehicle drive.Emitter mainly comprises micro-control unit and wireless transmitting unit integration module, antenna matching and antenna element, temperature and pressure sensor, vibroswitch, battery unit, and receiver mainly comprises wireless receiver, microcontroller, LCD MODULE, LED display lamp, buzzer phone, reset circuit, RS232/TTL level translator and 12V/5V voltage changer.Micro-control unit one end is connected with the temperature and pressure sensor, the other end connects wireless transmitting unit, the radio frequency output pin of wireless transmitting unit is connected to antenna matching network, micro-control unit does not have clock oscillation circuit, its clock frequency is provided by the wireless transmitting unit internal clock generator, the vibroswitch of emitter directly links to each other with micro-control unit, micro-control unit and wireless transmitting unit integration module are made of emission micro-control unit and wireless transmitting unit, the wireless receiver of receiver directly links to each other with the reception microcontroller, receive microcontroller respectively with LCD MODULE, buzzer phone, reset circuit, the RS232/TTL level translator links to each other with the 12V/5V voltage changer, shows that with LED battle array links to each other by shift register and receive microcontroller.
Advantage of the present invention is: adopt wireless mode that the tire safety state of automobile is carried out monitoring in real time, this system not only adopts the reliability based on the encapsulation of MEMS technical guarantee, and by using vibroswitch, low-power consumption components and parts, energy-conservation algorithm and batteries in parallel connection to realize the expenditure of energy optimization and prolonging the emitter work long life, receiver not only carries out low pressure sound, light alarm, high pressure sound, light alarm and high temperature alarm, can also pass to Liquid Crystal Display (LCD) or automobile instrument panel demonstration obtaining tire state.
Description of drawings
Fig. 1 radio vehicle tyre safety monitoring system schematic;
Fig. 2 transmitter architecture block diagram of the present invention;
Fig. 3 transmitter circuitry schematic diagram of the present invention;
Fig. 4 receiver structure block diagram of the present invention;
Fig. 5 receiver circuit schematic diagram of the present invention;
The energy-conservation algorithm flow block diagram of Fig. 6 emitter work of the present invention;
Fig. 7 vibroswitch of the present invention is to the management block diagram of emitter mode of operation.
The specific embodiment
Further specify embodiment of the present utility model below in conjunction with accompanying drawing, referring to Fig. 1,2,3, the emitter that the present invention includes is made up of battery unit, pressure and temperature sensor, vibroswitch, micro-control unit and wireless transmitting unit integration module, antenna and antenna matching unit.Described battery unit is by the requirement that increases capacity of cell and meet the MEMS encapsulation in parallel of two batteries, take diode prevention counter-current, take lc circuit to carry out power filter, in addition, battery takes traditional passing method to carry out the reliability welding, helps tackling high temperature and the frequent harsh environment of vibration in the tire; Described pressure and temperature testing circuit is connected and composed by pressure and temperature sensor and micro-control unit, pressure and temperature sensor U1 /the OUT pin links to each other with the KBD3 of micro-control unit U2, send to micro-control unit every the several seconds and to wake pulse up, then whether go gaging pressure or temperature by the micro-control unit decision; Micro-control unit is connected with pressure and temperature sensor U1 with wireless transmitting unit integration module U2, and the pressure and temperature DATA REASONING depends on the control line of micro-control unit and wireless transmitting unit integration module U2 and pressure and temperature sensor U1, the co-ordination between clock line CLK, data line DATA and the output line/OUT; Micro-control unit and wireless transmitting unit integration module U2 /RST links to each other with the RSTB of pressure and temperature sensor U1, and the system that makes resets at set intervals, so that system can turn back to normal condition when makeing mistakes; The relevant I/O mouth of micro-control unit and wireless transmitting unit integration module U2 links to each other with peripheral hardware debugging plate, realizes the download and the debugging of program; Micro-control unit links to each other with crystal with pin XTAL1, the XTAL0 of wireless transmitting unit integration module U2, constitutes the oscillator of phaselocked loop; And the digital output pin DATACLK of wireless transmitting unit provides reference clock to micro controller unit; Micro-control unit links to each other with antenna matching network with the pin RFOUT of wireless transmitting unit integration module U2, matching network is made of inductance, electric capacity, matching network connects electronically small antenna, realize 50 optimum Ω radio frequency matching networks, reduce radio frequency loss, improve emission efficiency, satisfy the needs of emitter based on the MEMS encapsulation; R1 one end links to each other with the pin REXT of micro-control unit with wireless transmitting unit integration module U2, and the other end links to each other with ground, the size of control wireless transmitting unit horsepower output; Capacitor C 3, resistance R 6 parallel connections, wherein an end links to each other with the pin CFSK of micro-control unit with wireless transmitting unit integration module U2, and the other end links to each other with ground, the size of the carrier frequency frequency deviation that determined to transmit; In micro-control unit and the wireless transmitting unit integration module, pin PTB1, the PTB2 of micro-control unit controls, PTB0, PTA7 pin are controlled four digital input pin ENABLE, DATA, BAND, the MODE of wireless transmitting unit respectively, make that the radio-frequency transmissions circuit can normal operation.
Referring to Fig. 4, Fig. 5, the receiver that the present invention includes is made up of antenna and antenna matching unit, receptor, microcontroller, LCD MODULE, LED display lamp, buzzer phone, reset unit, RS232/TTL level translator and 12V/5V voltage changer.Described antenna and antenna matching unit are adopted
Little day of electricity Line, constituting 50 Ω matching networks by inductance, electric capacity, high efficiency antenna and antenna matching network have improved the sensitivity of receiver; Described receptor U2 has the clock oscillation circuit that is made of capacitor C 2, capacitor C 3 and crystal CRYSTAL1, reference clock is provided for respectively the phaselocked loop and the intermediate frequency filtering of receptor; The resistance R 3 of receptor U2, capacitor C 7 have determined the frequency values of strobe oscillator, make receiver can be operated in operation/sleep state, improve the work efficiency of receptor and the expenditure of energy of minimizing receptor; The sensitivity that helps improving receptor is chosen in the optimization of the capacitor C 1 on the pin CAGC of receptor U2; The resistance R 7 of receptor U2, capacitor C 22, capacitor C 23 constitute the external loop filter of integrated phase lock, and it is in parallel with inner filter, has improved the performance of the local oscillator of receptor; MOSI, MISO, the SCLOCK of receptor U2 and microcontroller U1 link to each other respectively, carry out communication by the SPI interface, and the P2.3 port of the RESETB of receptor U2 and microcontroller U1 links to each other; Microcontroller U1 is the MCU that has clock oscillation, the P0 port of U1 and the data line of LCD MODULE, and the P2.5 of microcontroller U1, P2.6, P2.7 link to each other with the control line of display module; UART serial ports P3.0, the P3.1 of microcontroller U1 links to each other with R1out, the T1in of RS232/TTL level translator U5 respectively, and T2out, the R2in of RS232/TTL level translator U5 link to each other with DB9 interface JP7, realize the communication of vehicle electronics external devices such as microcontroller U1 and computing machine; The RESET mouth of microcontroller U1 links to each other with reset unit/RESET, guarantee microcontroller power on, electricity shortage causes the reliable reset under the abnormal work situation; The P3.4 of microcontroller U1, P3.5, P3.6, P3.7, P2.0 respectively with SER, the SRCK of shift register U4 ,/SRCLR, RCK ,/G links to each other, displacement by control data, latch and enable to drive, realize the normal demonstration of LED, LED adopts two-color diode, with different glow colors and state display of tyre mode of operation; The P2.4 of microcontroller U1 links to each other with resistance R 16, and the other end of resistance R 16 links to each other with light-emitting diode D5, indication receiver power supply state; The P2.1 of microcontroller U1 links to each other with resistance R 23, the feasible abnormality alarming that removes to drive buzzer phone LS1 with suitable voltage and current; Microcontroller U1 /EA links to each other with an end of resistance R 1, and the other end of resistance R 1 links to each other with positive source, makes program in the microcontroller U1 operation internal program memory; Microcontroller U1 /PSEN links to each other with an end of resistance R 2 by switch JP1, and the other end of resistance R 2 links to each other with ground, so that the program test of microcontroller U1 and download, and be the modification or the upgrading of product user receiver software in the future; The input end INPUT of 12V/5V voltage changer U6 links to each other with the power supply of+12V automobile, the operator's compartment Cigarette lighter provides+12V voltage, mouth OUTPUT links to each other with receiver+5V power supply, and Da Rong value capacitor C 26, capacitor C 27 are carried out power filter to the input and output side of 12V/5V voltage changer U6 respectively; Diode D6, diode D7, resistance R 22 parallel connections, their ends link to each other with voltage VCC, and the other end links to each other with aanalogvoltage AVdd, realizes the digital voltage of microcontroller U1 and the isolation of aanalogvoltage, improves the stability of microcontroller U1 work.
A kind of energy-efficient intelligent algorithm can improve the stability and the normal operation time limit of system, avoids data to make mistakes and conflict as much as possible.When a plurality of tire modules send data simultaneously data collision may take place, for fear of the loss of data that is caused by conflict, module should send a plurality of frame bags at random between each Frame.
Referring to Fig. 6, emitter of the present invention is based on the radio vehicle tyre safety monitoring device of MEMS.The whole algorithm of above-mentioned emitter is based upon battery load steadily in the long term on the working foundation.Sensor has a very fast response for the inquiry of pressure and temperature, with respect to temperature detection, the pressure detection power consumption is more, so the gaging pressure number of times is few more good more, but, also need in time send the pressure detection alarm to the driver except regularly detecting the wheel condition.The sensor overwhelming majority time all is under other idle pulley of power consumption nW level, sends wake-up signal every the several seconds to micro-control unit, wakes up at every turn, and micro-control unit just goes to measure a secondary data.Control the function situation of system by controller.The algorithm of the exquisiteness that this emitter adopted will reduce system is not influencing the minimum transmission number of times of use under the emission data efficiency situation, thereby reaches the efficient utilization to energy.In addition, the stop mode of controller also is a key.
The microprocessing unit overwhelming majority time of emitter is in energy saver mode (stop mode).Sensor woke microprocessing unit up once every several seconds, in case wake up, detected pressures value under the control of microprocessor just, temperature value and battery status are also preserved data.Then pressure and temperature value and last group of data are compared, if any bigger variation (surpassing default rated value), perhaps this moment, the temperature, pressure value surpassed certain value (surpassing warning value), then will newly be worth by emitter and launch, receiver display end update displayed data.If there is not marked change, microprocessor is got back to energy saver mode.
The maxim of micro-control unit meeting intellectual analysis storage and the difference of minimum value, if difference is greater than the fixedly difference of the maximum of storing among the ROM, module will enter the fastest sending mode, in the fastest sending mode, with 800ms 255 data of time transmission to 900ms.So greatly increased receptor and can receive the possibility of data, leaked gas, can in time remind driver's emergency if detect tire.
Receiver of the present invention the energising after, the at first initialization of the controller of receiving end, configuring receiver then.After the Verification Receiver configuration was finished, system's lamp flicker showed that once receiving end has been ready to receive data.In the time of pending datas such as receiving end, receiving end is in the low power consuming state.After receiver captures data, carry out verification and comparison again, after the checking, the tire data in tire data that receives and the controller storage is compared, if identical data are arranged, data are with processed processing.Under abnormal condition, the indicator lamp of corresponding tire can be lighted and constantly flicker, the simultaneity factor alarm of sounding.In addition, data will be passed through serial ports or extendable functions interface, collector and the storage equipment of data transmission to the external world.
Referring to Fig. 7, for life-span that prolongs emitter and the efficient that improves emitter, need effectively manage power supply, consume too quickly to avoid the energy content of battery.When stationary vehicle or v＜=10km/m, just there is no need to carry out the continuous gauging data and transmit continuously, promptly emitter is operated in the pattern of parking, the number of times that reduces take off data and transmit.When vehicle movement speed per hour v＞10km/m, emitter is operated in normal driving mode, normal take off data and transmitting.A vibroswitch is adopted in this invention, and when stationary vehicle, switch disconnects, and only switch connects when the vehicle speed per hour surpasses 10km/h.Under the automobile halted state, send a tire condition signal to save the energy content of battery every half an hour.
Claims (9)
1. radio vehicle tyre safety monitoring system, mainly comprise: can place the emitter in the tire and place the indoor receiver two large divisions of vehicle drive, emitter mainly comprises micro-control unit and wireless transmitting unit integration module, antenna matching and antenna element, the temperature and pressure sensor, vibroswitch, battery unit, receiver mainly comprises wireless receiver, microcontroller, LCD MODULE, the LED display lamp, buzzer phone, reset circuit, RS232/TTL level translator and 12V/5V voltage changer, it is characterized in that: micro-control unit one end is connected with the temperature and pressure sensor, the other end connects wireless transmitting unit, the radio frequency output pin of wireless transmitting unit is connected to antenna matching network, micro-control unit does not have clock oscillation circuit, its clock frequency is provided by the wireless transmitting unit internal clock generator, the vibroswitch of emitter directly links to each other with micro-control unit, the wireless receiver of receiver directly links to each other with the reception microcontroller, receive microcontroller respectively with LCD MODULE, buzzer phone, reset circuit, the RS232/TTL level translator is connected with the 12V/5V voltage changer, shows that with LED battle array is connected by shift register and receive microcontroller.
2. a kind of radio vehicle tyre safety monitoring according to claim 1 system, the pressure and temperature testing circuit that it is characterized in that emitter is connected and composed by pressure and temperature sensor and micro-control unit, pressure and temperature sensor U1 /the OUT pin links to each other with the KBD3 of micro-control unit U2, micro-control unit and wireless transmitting unit integration module U2 /RST links to each other with the RSTB of pressure and temperature sensor U1, and the relevant I/O mouth of micro-control unit and wireless transmitting unit integration module U2 links to each other with peripheral hardware debugging plate.
3. a kind of radio vehicle tyre safety monitoring according to claim 1 system, it is characterized in that the micro-control unit of emitter and pin XTAL1, the XTAL0 of wireless transmitting unit integration module U2 link to each other with crystal, constitute the oscillator of phaselocked loop, the digital output pin DATACLK of wireless transmitting unit provides reference clock frequency to micro controller unit.
4. a kind of radio vehicle tyre safety monitoring according to claim 1 system, it is characterized in that the micro-control unit of emitter and the pin RFOUT of wireless transmitting unit integration module U2 link to each other with antenna matching network, matching network is made of inductance, electric capacity, R1 one end links to each other with the pin REXT of micro-control unit with wireless transmitting unit integration module U2, the other end links to each other with ground, the size of control wireless transmitting unit horsepower output; Capacitor C 3, resistance R 6 parallel connections, wherein an end links to each other with the pin CFSK of micro-control unit with wireless transmitting unit integration module U2, the other end links to each other with ground, and pin PTB1, the PTB2 of micro-control unit controls, PTB0, PTA7 pin are connected with four digital input pin ENABLE, DATA, BAND, MODE of wireless transmitting unit respectively.
5. a kind of radio vehicle tyre safety monitoring according to claim 1 system, the battery unit that it is characterized in that emitter is taked diode prevention counter-current by two battery parallel connections, and lc circuit carries out power filter, and battery welds with passing method.
6. a kind of radio vehicle tyre safety monitoring according to claim 1 system is characterized in that the vibroswitch of launching installation connects when the vehicle speed per hour surpasses 10km/h, disconnect when stationary vehicle, sends one time tire condition signal every half an hour.
7. a kind of radio vehicle tyre safety monitoring according to claim 1 system, the antenna and the antenna matching unit that it is characterized in that receiver constitute 50 Ω matching networks by inductance, electric capacity, receptor U2 has the clock oscillation circuit that is made of capacitor C 2, capacitor C 3 and crystal CRYSTAL1, the resistance R 3 of receptor U2, capacitor C 7 are determined the frequency values of strobe oscillator, the pin CAGC of receptor U2 inserts capacitor C 1, and the integrated phase lock external loop filter that resistance R 7, capacitor C 22, capacitor C 23 constitute links to each other with receptor U2.
8. a kind of radio vehicle tyre safety monitoring according to claim 1 system, it is characterized in that the receptor U2 of receiver and the MOSI of microcontroller U1, MISO, SCLOCK links to each other respectively, by the SPI interface communication, the P2.3 port of the RESETB of receptor U2 and microcontroller U1 links to each other, microcontroller U1 is the MCU that has clock oscillation, the P0 port of U1 links to each other with the data line of LCD MODULE, the P2.5 of microcontroller U1, P2.6, P2.7 links to each other with the control line of display module, the UART serial ports P3.0 of microcontroller U1, P3.1 respectively with the Rlout of RS232/TTL level translator U5, Tlin links to each other, and the T2out of RS232/TTL level translator U5, R2in links to each other with DB9 interface JP7, the RESET mouth of microcontroller U1 links to each other with reset unit/RESET, the P3.4 of microcontroller U1, P3.5, P3.6, P3.7, P2.0 respectively with the SER of shift register U4, SRCK, / SRCLR, RCK, / G links to each other, displacement by control data, latch, driving LED, the P2.4 of microcontroller U1 links to each other with resistance R 16, the other end of resistance R 16 links to each other with light-emitting diode D5, the P2.1 of microcontroller U1 links to each other with resistance R 23, microcontroller U1 /EA links to each other with an end of resistance R 1, the other end of resistance R 1 links to each other with positive source, make microcontroller U1 move the program in the internal program memory, microcontroller U1 /PSEN links to each other with an end of resistance R 2 by switch JP1, and the other end of resistance R 2 links to each other with ground.
9. a kind of radio vehicle tyre safety monitoring according to claim 1 system, the input end INPUT that it is characterized in that the 12V/5V voltage changer U6 of receiver links to each other with automobile cab Cigarette lighter 12V mouth, mouth OUTPUT links to each other with receiver+5V power supply, Da Rong value capacitor C 26, capacitor C 27 are carried out power filter to the input and output side of 12V/5V voltage changer U6 respectively, diode D6, diode D7, resistance R 22 parallel connections, their ends link to each other with voltage VCC, and the other end links to each other with aanalogvoltage AVdd.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB200410018355XA CN100500457C (en) | 2004-05-14 | 2004-05-14 | Wireless car tires safety monitoring system |
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| CNB200410018355XA CN100500457C (en) | 2004-05-14 | 2004-05-14 | Wireless car tires safety monitoring system |
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| CN1695964A true CN1695964A (en) | 2005-11-16 |
| CN100500457C CN100500457C (en) | 2009-06-17 |
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| CNB200410018355XA Expired - Lifetime CN100500457C (en) | 2004-05-14 | 2004-05-14 | Wireless car tires safety monitoring system |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101941362A (en) * | 2009-07-02 | 2011-01-12 | 通用汽车环球科技运作公司 | The low noise run-flat tire |
| CN102463859A (en) * | 2010-11-18 | 2012-05-23 | 江西凯源科技有限公司 | Simple electronic tire pressure monitor |
| CN101638039B (en) * | 2009-08-25 | 2012-05-23 | 深圳职业技术学院 | Vehicle-running wireless monitoring and recording device |
| CN103273809A (en) * | 2013-05-24 | 2013-09-04 | 上海为彪汽配制造有限公司 | Tire condition receiving system and signal conversion modules thereof |
| CN104385861A (en) * | 2014-10-21 | 2015-03-04 | 中山市六源通电子科技有限公司 | Multifunctional tire pressure monitoring system |
| CN104599471A (en) * | 2015-01-05 | 2015-05-06 | 广州杰赛科技股份有限公司 | Monitoring device, method and system |
| CN108146157A (en) * | 2016-12-02 | 2018-06-12 | 因派克伊莱克斯 | tire sensor and its manufacturing method |
| CN109557339A (en) * | 2018-11-16 | 2019-04-02 | 陕西千山航空电子有限责任公司 | A kind of three axis accelerometer and impact search switch |
-
2004
- 2004-05-14 CN CNB200410018355XA patent/CN100500457C/en not_active Expired - Lifetime
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101941362A (en) * | 2009-07-02 | 2011-01-12 | 通用汽车环球科技运作公司 | The low noise run-flat tire |
| US8746302B2 (en) | 2009-07-02 | 2014-06-10 | GM Global Technology Operations LLC | Low noise run-flat tires |
| CN101941362B (en) * | 2009-07-02 | 2015-04-22 | 通用汽车环球科技运作公司 | Low noise run-flat tires |
| CN101638039B (en) * | 2009-08-25 | 2012-05-23 | 深圳职业技术学院 | Vehicle-running wireless monitoring and recording device |
| CN102463859A (en) * | 2010-11-18 | 2012-05-23 | 江西凯源科技有限公司 | Simple electronic tire pressure monitor |
| CN103273809A (en) * | 2013-05-24 | 2013-09-04 | 上海为彪汽配制造有限公司 | Tire condition receiving system and signal conversion modules thereof |
| CN104385861A (en) * | 2014-10-21 | 2015-03-04 | 中山市六源通电子科技有限公司 | Multifunctional tire pressure monitoring system |
| CN104599471A (en) * | 2015-01-05 | 2015-05-06 | 广州杰赛科技股份有限公司 | Monitoring device, method and system |
| CN104599471B (en) * | 2015-01-05 | 2018-05-18 | 广州杰赛科技股份有限公司 | A kind of monitoring device, method and system |
| CN108146157A (en) * | 2016-12-02 | 2018-06-12 | 因派克伊莱克斯 | tire sensor and its manufacturing method |
| CN109557339A (en) * | 2018-11-16 | 2019-04-02 | 陕西千山航空电子有限责任公司 | A kind of three axis accelerometer and impact search switch |
| CN109557339B (en) * | 2018-11-16 | 2021-03-26 | 陕西千山航空电子有限责任公司 | Triaxial accelerometer and impact detection switch |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100500457C (en) | 2009-06-17 |
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